chore: initialize taskplane tasks

taskplane-tasks/EXAMPLE-001-hello-world/PROMPT.md

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+# Task: EXAMPLE-001 — Hello World
+
+**Created:** 2026-04-08
+**Size:** S
+
+## Review Level: 0 (None)
+
+**Assessment:** Trivial single-file task to verify Taskplane is working.
+**Score:** 0/8 — Blast radius: 0, Pattern novelty: 0, Security: 0, Reversibility: 0
+
+## Canonical Task Folder
+
+```
+taskplane-tasks/EXAMPLE-001-hello-world/
+├── PROMPT.md   ← This file (immutable above --- divider)
+├── STATUS.md   ← Execution state (worker updates this)
+├── .reviews/   ← Reviewer output (task-runner creates this)
+└── .DONE       ← Created when complete
+```
+
+## Mission
+
+Create a simple `hello-taskplane.md` file in the project root to verify that
+Taskplane task execution is working correctly. This is a smoke test — if the
+worker can read this prompt, create the file, checkpoint progress, and mark the
+task done, the installation is healthy.
+
+## Expected File Content
+
+`hello-taskplane.md` should include:
+
+- A title line (for example: `# Hello from Taskplane`)
+- A line containing the task ID: `EXAMPLE-001`
+- A line containing today's date
+
+## Dependencies
+
+- **None**
+
+## Context to Read First
+
+_No additional context needed._
+
+## Environment
+
+- **Workspace:** Project root
+- **Services required:** None
+
+## File Scope
+
+- `hello-taskplane.md`
+
+## Steps
+
+### Step 0: Preflight
+
+- [ ] Verify this PROMPT.md is readable
+- [ ] Verify STATUS.md exists in the same folder
+
+### Step 1: Create Hello File
+
+- [ ] Create `hello-taskplane.md` in the project root
+- [ ] Add a title plus lines containing today's date and task ID `EXAMPLE-001`
+
+### Step 2: Verification
+
+- [ ] Verify `hello-taskplane.md` exists and matches the expected content
+
+### Step 3: Delivery
+
+
+
+## Documentation Requirements
+
+**Must Update:** None
+**Check If Affected:** None
+
+## Completion Criteria
+
+- [ ] `hello-taskplane.md` exists in the project root
+- [ ] `hello-taskplane.md` includes a title, task ID (`EXAMPLE-001`), and current date
+
+## Git Commit Convention
+
+- **Implementation:** `feat(EXAMPLE-001): description`
+- **Checkpoints:** `checkpoint: EXAMPLE-001 description`
+
+## Do NOT
+
+- Modify any existing project files
+- Create files outside the project root
+- Over-engineer this — it's a smoke test
+
+---
+
+## Amendments (Added During Execution)
+
+<!-- Workers add amendments here if issues discovered during execution. -->